/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package msgconnpool

import (
	"math/rand"
	"time"
)

var backoffDurationList = []time.Duration{
	0, // 0 is just for placeholder, the first time of reconnect will use a random time between 0 ~ 1s
	time.Second,
	time.Second * 2,
	time.Second * 5,
	time.Second * 10,
}

func getBackOffDuration(idx int) time.Duration {
	switch {
	case idx == 0:
		t := time.Duration(rand.Int63n(time.Second.Nanoseconds()))
		return t
	case idx >= len(backoffDurationList):
		idx = len(backoffDurationList) - 1
		return backoffDurationList[idx]
	}

	return backoffDurationList[idx]
}
